PHILADELPHIA, Pa. – Philadelphia police released surveillance footage on Thursday that shows the shooting death of a young woman in a robbery-turned-homicide, reports CBS Philadelphia.Authorities said Amber Long, 26, was shot by an assailant around 10:30 p.m. on Sunday while walking down the street with her mother in the Northern Liberties section of Philadelphia. Police released the surveillance video in an attempt to get help identifying her killers.The victim's mother, Stephanie Long, reportedly said Amber was killed when she refused to give up her purse. “I believe the men saw them and thought they were easy targets,” Philadelphia Police Captain James Clark told reporters Monday afternoon.